<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
    <div id="root">
        姓：<input type="text" v-model="firstName"> <br>
        名：<input type="text" v-model="lastName"> <br>
        全名：{{firstName}}-{{lastName}}
    </div>

    <script>

        Vue.config.productionTip = false

        new Vue({
            el:'#root', 
            data:{
                firstName:'张',
                lastName:'三'
            }
        })
    </script>
</body>
</html>